Filter-cloth.



No. 772,132. L PATENTED OCT. 11, 1904.

` J. GROSSLEY.

FILTER CLOTH.

No MODEL.

Wdh/Lexus UNITED STATES Patented October 11, 1904.

4PATENT OFFICE.

FILTER-CLOTH.

SPECIFICATION forming part of Letters Patent No. 772,132, dated October 11, 1904.

Application filed April 11, 1904.

To all whom, t may concern.-

Be it known that I, JOSEPH CRossLEY, a citizen of the United States, residing at Trenton,` in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Filter-Cloths; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates primarily to pressurefilters, has especial reference to filter-cloths used in connection with such filters, and consists in certain improvements, which will be fully disclosed in the following specification and claims.

In the construction of lter-cloths it is the prevailing practice to stitch the canvas around the feed-hole in the manner of working buttonholes to prevent fraying of the fabric or to rivet metallic washers to the cloth on opposite sides thereof, and in bag or double filter-cloths metallic eyelets have been inserted near the upper edges to support the cloth. The stitching soon wears off, and the metallic washers and eyelets interfere seriously with the wash-` ing of the cloths by machinery, such as centrifugal washing-machines, in that they cut the fabric and destroy the cloths, thus necessitating the washing of the cloths by hand, which is slow, tedious, and expensive. It-is my purpose to overcome these serious objections by providing the feed-hole and other holes or openings in the filter-cloths with a iieXible reinforce -adhesively applied to the fabric and preferably embedded therein by pressure, so as to become integral therewith and inseparable therefrom.

In the accompanying drawings, which form part of this specification, Figure 1 represents a plan of a section of a single filter-cloth with a reinforce surrounding the feed-hole; Fig. 2, a vertical longitudinal section of the same; Fig. 3, a side elevation of a'double filter-,cloth embodying my invcntion;Fig. 4, a section showing a reinforce applied to the outer side of each part of a double filter-cloth before Vulcanizing the reinforces; Fig. 5, alike view of the same after vulcanization of the reinforces, and Fig. 6 a like View showing a sin- Serial No. 202,647. (No model.)

gle reinforce inserted between the two parts of a double filter-cloth and around the feedhole.

Reference being had to the drawings and the designating characters thereon, 1 indicates a filter-cloth made of pervious material, such kas canvas,` and is provided with the usual feedhole 2, surrounded by a reinforce 3, of flexible material, preferably rubber, which is adhesively applied thereto by vulcanizaton of the rubber on the cloth under pressure, whereby the rubber is forced or pressed into the interstices of the canvas to embed therein or incorporate therewith.

In Figs. l, 2, and 3 the filter-cloth is of a rectangular form, with the feed-hole 2 surrounded by a reinforce 3 on one side of the cloth only. In Figs. 4 and 5 a double cloth is shown, with a reinforce 3 on the outside of the two thicknesses of the cloth, and in Fig. 6 the reinforce is shown between the two thicknesses of the cloth. Fig. 4 shows the reinforces 3 extending beyond the wall of the feed-hole, the position in which they are applied to the cloth, and Fig. 5 shows the overlapping portions of the reinforces united at 5', the result of the pressure applied, and the vulcanization. In Fig. 3 the holes 4, by which the filter-cloth is secured in the filter-press, are also provided with the reinforces 3.

Having thus fully described my invention, what I claim isl. A filter-cloth of pervious material having an opening therein provided with a flexible reinforce surrounding the opening and adhesively joined to the cloth.

2. A filter-cloth of pervious material having an opening therein provided with a surrounding fleXible reinforce embedded in or incorporated with the cloth.

3. A filter-cloth of pervious material having an opening therein provided with a surrounding rubber reinforce embedded in the cloth and vulcanized.

In testimony whereof I aix my signature in presence of two witnesses.

.JOSEPH CROSSLEY.

Witnesses:

JOHN B. CQLE, FRANK M. TOMER. 

